//JavaScript Document
jQuery.extend({

	createUploadIframe: function(id, uri)
	{
		//create frame
		var frameId = 'jUploadFrame' + id;

		if(window.ActiveXObject) {
			//var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
			if(jQuery.browser.version=="9.0" || jQuery.browser.version=="10.0"){  
				var io = document.createElement('iframe');  
				io.id = frameId;  
				io.name = frameId;  
			}else if(jQuery.browser.version=="6.0" || jQuery.browser.version=="7.0" || jQuery.browser.version=="8.0"){  
				var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');  
				if(typeof uri== 'boolean'){
					io.src = 'javascript:false';
				}
				else if(typeof uri== 'string'){
					io.src = uri;
				}
			}
		}else {
			var io = document.createElement('iframe');
			io.id = frameId;
			io.name = frameId;
		}
		io.style.position = 'absolute';
		io.style.top = '-1000px';
		io.style.left = '-1000px';

		document.body.appendChild(io);

		return io;   
	},
	createUploadForm: function(id, fileElementId, data)
	{
		//create form 
		var formId = 'jUploadForm' + id;
		var fileId = 'jUploadFile' + id;
		var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>'); 
//		var oldElement = jQuery(fileElementId);
		var oldElement = jQuery('#' + fileElementId);
		var newElement =oldElement.clone(true);
		jQuery(oldElement).attr('id', fileId);
		jQuery(oldElement).before(newElement);
		jQuery(oldElement).appendTo(form);

		//add data
		if(data) { 
			for (var i in data) { 
				$('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form); 
			} 
		}
		//set attributes
		jQuery(form).css('position', 'absolute');
		jQuery(form).css('top', '-1200px');
		jQuery(form).css('left', '-1200px');
		jQuery(form).appendTo('body');  
		return form;
	},

	ajaxFileUpload: function(s) {
		// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout  
		s = jQuery.extend({}, jQuery.ajaxSettings, s);
		var id = s.id;        
		//var id = s.fileElementId;        
		var form = jQuery.createUploadForm(id, s.fileElementId,s.data);
		var io = jQuery.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;  

		if( s.global && ! jQuery.active++ ){
			// Watch for a new set of requests
			jQuery.event.trigger( "ajaxStart" );
		}            
		var requestDone = false;
		// Create the request object
		var xml = {};   
		if( s.global ){
			jQuery.event.trigger("ajaxSend", [xml, s]);
		}            

		var uploadCallback = function(isTimeout){  
			// Wait for a response to come back 
			var io = document.getElementById(frameId);
			try{    
				if(io.contentWindow){
					xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
					xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
				}else if(io.contentDocument){
					xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
					xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
				}      
			}catch(e){
				jQuery.handleError(s, xml, null, e);
			}
			if( xml || isTimeout == "timeout"){    
				requestDone = true;
				var status;
				try {
					status = isTimeout != "timeout" ? "success" : "error";
					// Make sure that the request was successful or notmodified
					if( status != "error" ){
						// process the data (runs the xml through httpData regardless of callback)
						var data = jQuery.uploadHttpData( xml, s.dataType );                        
						if( s.success ){
							// ifa local callback was specified, fire it and pass it the data
							s.success( data, status );
						};                 
						if( s.global ){
							// Fire the global callback
							jQuery.event.trigger( "ajaxSuccess", [xml, s] );
						};                            
					} else{
						jQuery.handleError(s, xml, status);
					}

				} catch(e){
					status = "error";
					jQuery.handleError(s, xml, status, e);
				};                
				if( s.global ){
					// The request was completed
					jQuery.event.trigger( "ajaxComplete", [xml, s] );
				};

				// Handle the global AJAX counter
				if(s.global && ! --jQuery.active){
					jQuery.event.trigger("ajaxStop");
				};
				if(s.complete){
					s.complete(xml, status);
				};                 

				jQuery(io).unbind();
				setTimeout(function(){
					try{
						jQuery(io).remove();
						jQuery(form).remove(); 
					}catch(e){
						jQuery.handleError(s, xml, null, e);
					}}, 100);
				xml = null;
			};
		}
		// Timeout checker
		if( s.timeout > 0 ){
			setTimeout(function(){if(!requestDone ){uploadCallback( "timeout" );}}, s.timeout);
		}
		try{
			var form = jQuery('#' + formId);
			jQuery(form).attr('action', s.url);
			jQuery(form).attr('method', 'POST');
			jQuery(form).attr('target', frameId);
			if(form.encoding){
				form.encoding = 'multipart/form-data';    
			}else{    
				form.enctype = 'multipart/form-data';
			}   
			jQuery(form).submit();

		} catch(e){   
			jQuery.handleError(s, xml, null, e);
		}
		/*if(window.attachEvent){
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        }
        else{
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        }   */
		jQuery('#' + frameId).load(uploadCallback);
		return {abort: function () {}}; 

	},

	uploadHttpData: function( r, type ) {
		var data = !type;
		data = type == "xml" || data ? r.responseXML : r.responseText;
		// ifthe type is "script", eval it in global context
		if( type == "script" ){
			jQuery.globalEval( data );
		}

		// Get the JavaScript object, ifJSON is used.
		if( type == "json" ){
			data = r.responseText;  
			var start = data.indexOf(">");  
			if(start != -1) {  
				var end = data.indexOf("<", start + 1);  
				if(end != -1) {  
					data = data.substring(start + 1, end);  
				}  
			}  
			eval( "data = " + data);  
		}

		// evaluate scripts within html
		if( type == "html" ){
			jQuery("<div>").html(data).evalScripts();
		}

		return data;
	},
	/*handleError: function( s, xml, status, e ) {
		// If a local callback was specified, fire it
		if ( s.error )
			s.error( xml, status, e );

		// Fire the global callback
		if ( s.global )
			jQuery.event.trigger( "ajaxError", [xml, s, e] );
	}*/
	handleError: function( s, xhr, status, e ) {
		// If a local callback was specified, fire it
		if ( s.error ) {
			s.error.call( s.context || s, xhr, status, e );
		}
		// Fire the global callback
		if ( s.global ) {
			(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e] );
		}
	}
});
